67 lines
1.0 KiB
C
67 lines
1.0 KiB
C
#include <u.h>
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#include <libc.h>
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#include <regexp.h>
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void
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regsub(char *src, char *dst, int dlen, Resub *match, int msize)
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{
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int i;
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char *ep, c;
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ep = dst + dlen-1;
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for(;*src != '\0'; src++) switch(*src) {
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case '\\':
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switch(*++src) {
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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i = *src - '0';
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if(match != nil && i < msize && match[i].ep != nil) {
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c = *match[i].ep;
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*match[i].ep = '\0';
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dst = strecpy(dst, ep+1, match[i].sp);
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*match[i].ep = c;
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}
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break;
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case '\\':
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if(dst < ep)
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*dst++ = '\\';
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else
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goto End;
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break;
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case '\0':
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goto End;
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default:
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if(dst < ep)
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*dst++ = *src;
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else
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goto End;
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break;
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}
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break;
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case '&':
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if(match != nil && msize > 0 && match[0].sp != nil) {
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c = *match[0].ep;
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*match[0].ep = '\0';
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dst = strecpy(dst, ep+1, match[0].sp);
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*match[0].ep = c;
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}
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break;
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default:
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if(dst < ep)
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*dst++ = *src;
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else
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goto End;
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break;
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}
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End:
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*dst = '\0';
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}
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